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Double polarization‐electric field (P‐E) loops were observed in Fe‐doped KTa0.57Nb0.43O3 (Fe‐KTN) crystals because of the restraining effect of the defect dipoles on domain reorientation. In Fe‐KTN crystals, the positively charged O2− vacancies and negatively charged dopant Fe3+ ions form defect dipoles, providing a restoring force for domain reorientation. Moreover, built‐in macro‐polarization was...
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